Re: fsync vs open_sync

Just out of interest, what happens to the difference if you use *ext3*
(perhaps with data=writeback)

regards

Mark
pgsql(at)mohawksoft(dot)com wrote:

>I did a little test on the various options of fsync.
>...
>create table testndx (value integer, name varchar);
>create index testndx_val on testndx (value);
>
>for(int i=0; i < 1000000; i++)
>{
> printf_query( "insert into testndx (value, name) values ('%d', 'test')",
>random());
>
> // report here
>}
>
>
>Anyway, with fsync enabled using standard fsync(), I get roughly 300-400
>inserts per second. With fsync disabled, I get about 7000 inserts per
>second. When I re-enable fsync but use the open_sync option, I can get
>about 2500 inserts per second.
>
>(This is on Linux 2.4 kernel, ext2 file system)
>
>
>
>